Pith Number

pith:34R62BSB

pith:2009:34R62BSBEBCE5LCUKMMBNNZKW5

not attested not anchored not stored refs pending

The Search for Celestial Positronium via the Recombination Spectrum

J. Bland-Hawthorn (University of Sydney), S. C. Ellis

arxiv:0910.3987 v1 · 2009-10-21 · astro-ph.HE · astro-ph.CO · astro-ph.GA · hep-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{34R62BSBEBCE5LCUKMMBNNZKW5}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T02:34:17.997126Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

df23ed064120444eac54531816b72ab75eae8fdbc3494b01cf3030a384c357f4

Aliases

arxiv: 0910.3987 · arxiv_version: 0910.3987v1 · doi: 10.48550/arxiv.0910.3987 · pith_short_12: 34R62BSBEBCE · pith_short_16: 34R62BSBEBCE5LCU · pith_short_8: 34R62BSB

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/34R62BSBEBCE5LCUKMMBNNZKW5 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: df23ed064120444eac54531816b72ab75eae8fdbc3494b01cf3030a384c357f4

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "da8f838aa443942ed1c373de2afb24b4c350a8bdfb0c91add7d92b55518e7ab4",
    "cross_cats_sorted": [
      "astro-ph.CO",
      "astro-ph.GA",
      "hep-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2009-10-21T02:15:52Z",
    "title_canon_sha256": "cbf2cc815fdf1ad56c093794fc9f87c0bd5d836e792ca9db8b22f98354e1426c"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0910.3987",
    "kind": "arxiv",
    "version": 1
  }
}